package com.gdut.gulimall.product.web;

import com.gdut.gulimall.product.entity.CategoryEntity;
import com.gdut.gulimall.product.service.CategoryService;
import com.gdut.gulimall.product.vo.Catalog2Vo;
import org.redisson.api.*;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.ResponseBody;

import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.AbstractQueuedSynchronizer;
import java.util.concurrent.locks.ReentrantLock;

/**
 * @author Drifiter
 * @create 2021-09-26 22:35
 */
@Controller
public class IndexController {

    @Autowired
    private CategoryService categoryService;

    @Autowired
    private RedissonClient redisson;

    @Autowired
    private StringRedisTemplate redisTemplate;

    @GetMapping({"/", "/index.html"})
    public String indexPage(Model model) {
        // TODO 1、查出所有的1级分类
        List<CategoryEntity> categoryEntities = categoryService.getLevel1Categorys();

        //视图解析器进行拼串:
        // classpath:/templates/ +返回值+ html
        model.addAttribute("categorys", categoryEntities);


        return "index";
    }

    //index/json/catalog.json
    @ResponseBody
    @GetMapping("/index/json/catalog.json")
    public Map<String, List<Catalog2Vo>> getCatalogJson() {
        Map<String, List<Catalog2Vo>> map = categoryService.getCatalogJson();
        return map;
    }


    @ResponseBody
    @GetMapping("/hello")
    public String hello() {

        // 1、获取一把锁，只要锁的名字一样，就是同一把锁
        RLock lock = redisson.getLock("my-lock");
        // 2.加锁
//        lock.lock();  //阻塞式等待  默认加的锁都是30s时间。

        // 1)、锁的自动续期，如果业务超长，运行期间自动给锁续上新的30s。不用担心业务时间长，锁自动过期被删掉
        // 2)、加锁的业务只要运行完成，就不会给当前锁续期，即使不手动解锁，锁默认在30s以后自动删除。

        lock.lock(30, TimeUnit.SECONDS); //10秒自动解锁,自动解锁时间一定要大于业务的执行时间。

        //问题:Lock.Lock(10, TimeUnit. SECONDS);在锁时间到了以后，不会自动续期。
        //1、如果我们传递了锁的超时时间，就发送给redis执行脚本，进行占锁，默认超时就是我们指定的时间
        // 2、如果我们未指定锁的超时时间，就使用30 * 1000【LockwatchdogTimeout看门狗的默认时间】
        // 只要占锁成功，就会启动一个定时任务【重新给锁设置过期时间，新的过期时间就是看门狗的默认时间】
        //  linternalLockLeaseTime【看门狗时间】/ 3,10s


        try {
            System.out.println("加锁成功，执行业务........" + Thread.currentThread().getId());
            Thread.sleep(30000);
        } catch (Exception e) {

        } finally {
            // 3.解锁
            System.out.println("释放锁..." + Thread.currentThread().getId());
            lock.unlock();
        }

        return "hello";

    }

    // 保证一定能读到最新数据,修改期间，写锁是一个排他锁（互斥锁）。读锁是一个共享锁
    // 写锁没释放读就必须等待
    // 读＋读:想当寸杰现l/写＋读:等待写锁释放
    // 写+写:阻塞方式
    // 读＋写:

    @GetMapping("/write")
    @ResponseBody
    public String writeValue(){

        RReadWriteLock readWriteLock = redisson.getReadWriteLock("rw-lock");
        RLock writeLock = readWriteLock.writeLock();

        writeLock.lock();

        String s = null;
        try {
            System.out.println("写锁加锁成功....."+Thread.currentThread().getId());
            //1.改数据加写锁，读数据加读锁
            s = UUID.randomUUID().toString();
            Thread.sleep(30000);
            redisTemplate.opsForValue().set("writeValue",s);
        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            System.out.println("写锁释放....."+Thread.currentThread().getId());
            writeLock.unlock();
        }

        return s;
    }
    

    @GetMapping("/read")
    @ResponseBody
    public String readValue(){


        
        RReadWriteLock readWriteLock = redisson.getReadWriteLock("rw-lock");
        RLock readLock = readWriteLock.readLock();
        //加读锁
        readLock.lock();
        String s = null;
        try {
            System.out.println("读锁加锁成功....."+Thread.currentThread().getId());
            Thread.sleep(30000);
            s = redisTemplate.opsForValue().get("writeValue");
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            System.out.println("读锁释放....."+Thread.currentThread().getId());
            readLock.unlock();
        }


        return s;

    }

    @GetMapping("/lockDoor")
    @ResponseBody
    public String lockDoor() throws InterruptedException {

        RCountDownLatch door = redisson.getCountDownLatch("door");
        door.trySetCount(5);
        door.await();  //等待闭锁完成

        return "放假了.....";
    }

    @GetMapping("/gogogo/{id}")
    @ResponseBody
    public String gogogo(@PathVariable("id") Long id){

        RCountDownLatch door = redisson.getCountDownLatch("door");
        door.countDown();  //计数减一

        return id+"班的人都走了...";
    }


    @GetMapping("/park")
    @ResponseBody
    public String park() throws InterruptedException {

        RSemaphore park = redisson.getSemaphore("park");
//        park.acquire();  //获取一个信号，获取一个值

        boolean b = park.tryAcquire();
        return "ok=>"+b;
    }

    @GetMapping("/go")
    @ResponseBody
    public String go(){

        RSemaphore park = redisson.getSemaphore("park");
        park.release(); // 释放一个信号

        return "ok";
    }

}
